heaters



(No Model.)

B. MOPARLAND & L.'PASSMORE.

GRATE FOR FURNACES, HEATERS, &o. No. 837,849. Patented Mar. 16, 1886.

n, PETERS. PhawLnnngnpMr. Waahinpon. n. c.

EDWARD MCFARLAND AND LEVIS PASSMORE, OF PHILADELPHIA, PA.

GRATE FOR FURNACES, HEATERS, 84C.

SPECIFICATION forming part of Letters Patent No. 337,849, dated March16, 1886.

Application filed May 13, 1885. Serial No. 165,291. (No model.)

.To all whom it may concern:

Be it known that we, EDWARD MOFARLAND and LEvIs PASSMORE, citizens ofthe United States, residing at Philadelphia, in the county ofPhiladelphia, State of Pennsylvania, have invented a new and usefulImprovement in Grates for Furnaces, Heaters, &c., of which the followingis a specification.

Our invention has reference to grates for furnaces and heaters; and itconsists in certain improvements, all of which are fully set forth inthe following specification, and shown in the accompanying drawings,which form part thereof.

Heretofore in grates formed of rocking bars or rotary reciprocatinggrates the consumed coal or ashes on the lower part of the fire werevery slowly and imperfectly removed through their action, and that, too,with an expenditure of much time and labor.

The object of our invention is to overcome these defects by so formingthe grate that it may be rotated continuously in one direction and bemade to positively bore out any obstruction to the draft, thus removingall ashes and slag in a speedy and positive manner. This action insuresthe fire being very hot, and consequently reduces the consumption offuel required to produce a given amount of heat, avoiding theaccumulation of ashes and thereby all obstructions to draft.

In the patent to Doyle, No. 121,236, is shown a reciprocating rotarygrate having radial cuttingbars made triangular in crosssection, theupper surface of said cutting-bars being oblique, and the forward orcutting edges vertical, thus forming open passage- Ways from above tobelow the grate.

In our construction the helical cuttinggrates are so formed that theforward or cutting edges of one projects over the rear or tail edges ofthe next, thus forming an oblique passage-way between them, but which isprotected from-above and prevents the fire falling through, except whenpositively rotated.

In the drawings, Figure 1 is a sectional elevation, on line m :0, of thelower part of a furnace provided with a grate embodying ourimprovements. Fig. 2 is an elevation of same with part in section. Fig.3 is a perspective View of the grate removed from the furnace and withpart of the cutters removed. Fig. 4 is a detail view showing how thecuttinggrates are fastened to the revolving frame. Fig. 5 is a sectionalelevation, showing how ,the grate is supported and allowed to rotate,and said section is taken in plane through one of thesupporting-rollers. Fig. 6 is asectional plan view on line 2 z.

A is the ash-pit, and B is the chamber above the grate, which issurrounded with fire-brick which rests upon the annular flange H in theusual manner.

0 is the grate proper, and consists of a circular motive frame formed oftwo concentric rings, D, connected by radial arms E, and upon which thecutting-grates K are supported. The outer ring, D, is provided with anannular bearing, G, and bevel-teeth F, which rest upon the anti-frictionrollers J, loosely carried upon bearings 1 secured to the adj ustablebrackets I, which are furnished with slot 13, through which bolts Ipass, whereby said brackets are adjustably secured to the flange H.These antifriction rollers J are formed with two flanges of differentdiameters, connected by a tapering hub, J, the inner face, J of thelarger flange being made flat, while the inner face, J", of the smallerflange is made inclined. The object of this construction is to enablesaid rollers to properlyhold and support the motive ring-frame of thegrate. WVhile the frame rests upon the flanges j of the rollers, theteeth F thereof fit down into the grooves and insure the rotating gratebeing properly and positively guided in its rotation.

The grates K are formed fan-shaped, and have their upper surfaceshelically curved, the forward ends rising in the form of cuttingteethabove the rear ends of the preceding grate, the two being separated by aspace, K, through which the ashes, separated by the boring action of thecutters, is caused to pass from above the grate down into the ash-pit.These grates K have the downwardly-extending and preferably taperingprong K which extend through holes 6 in the arms E, and may be securedtherein by pins K 6 are air-spaces around saidpins, extending up throughsaid arms E and prevent the said arm and prong from becoming burned.

The rings D of the motive grate-frame are provided with thelugs L L, theformer of which supports the grates at their rear ends, thereby holdingthe grates Clear of the supportingframes, allowing free circulation ofair and also giving a positive connection by which the backward thrustin the act of cutting is distributed over three points of connection between the said grates and their supportingframes. The outer periphery ofthe grateframe is provided with a series of teeth or projections, O, thefunction of which is to scrape the collecting ashes and coal frombetween the flange H and the grate and keep a clear open airpassage-way. The grate is rotated by a bevel-wheel, Q, secured to ashaft, R, which extends from the outside of the furnace into the ash-pitthereof, passing through a dusttight journaled box, R, which preventsthe passage of dust from the shaft into the hot-air space of thefurnace. The outer end of the shaft R is journaled in the frame T andcarries a sprocket-wheel, S, which is connected by a chain, 8, with asprocket-pinion, S, journaled in the upper part of the frame T andadapted. to be rotated by a crank, S By this means a small amount ofpower exerted on the crank will with facility rotate the grate,overcoming all resistances in the bed of coal supported thereon, cuttingaway the under part thereof and insuring the entire fire beingthoroughly cleaned.

The center part of the grate-frame is made circular, forming anaperture, M, into which fits a removable grate, N, hinged by arms N to abracket, n, secured upon the under side of the flange H and directly infront of the door.

Hinged to the arms N is a lever, O, which extends through the frontpart, 1?, of the furnace and is provided with a handle, 0, and notches Oand stop 0 the former of which, by catching upon the part P of thefurnace, holds the grate N fully up in its position or just slightlybelow the frame of the grate 0, whereby a poker may be inserted and anyclinkers can be thrust down into the ash-pit without dropping the centerof the fire out or by letting the grate end fully down, the movementbeing arrested by stop 0 in which case the entire center of the fire maybe dropped out and the contents of the furnace pushed down into theashpit.

In case any grate K becomes burned out, another grate may be insertedwithout putting out the fire by simply scraping away coal, and afterwithdrawing the burned grate drop a new one into position.

We do not limit ourselves to the particular constructions shown, as theymay be modified in various ways without departing from our invention.

we claim as new, and desire to secure by Letters Patent, is-

1. A rotary furnace-grate provided with 1 cutting teeth or grates bywhich a rotation of the grate cuts positively into the ashes andcinders, forcing them from above to below the same, the forward orcutting edge of one grate extending above the rear or tail edge of thegrate next behind it, so as to form an oblique passage-way,substantially as and for the 2. A rotary grate provided with a circle ofseparate and removable inclined teeth or grates upon its upper'surface,the cutting-edge of each of said teeth or grates overlapping the rearportion of the one succeeding it, substan tially as described.

3. A rotary grate provided with a circle of separate removable inclinedteeth or grates upon its upper surface, the cutting-edge on each of saidteeth or grates overlapping the rear portion of the one succeeding itandin which the teeth are of less width than the radius of the grateproper, forming a circular opening in the center, in combination with astationary grate which fits into and fills said opening, substantiallyas described.

4. In a furnace, a rotarygrate having gearteeth, in combination withgrooved supporting-rollers to receive the gear-teeth of the gratepositively supporting and guiding it, a bevel-pinion meshing therewith,and ashaft secured thereto and extending from within the ash-pit to theoutside of the furnaces, by which said grate may be rotated,substantially as and for the purpose specified.

5. In a furnace, a rotary grate having gearteeth, in combination withgrooved supporting-rollers to receive the gear-teeth of the gratepositively supporting and guiding it, a bevel-pinion meshing therewith,and a shaft secured thereto and extending from within the ash-pit to theoutside of the furnace by which said grate may be rotated, andsprocketwheels, chain, and crank I to rotate said shaft, substantiallyas and for the purpose specified.

6. The combination of the frame D E with helical cuttergrates K, inwhich their forward ends, k, are raised and their rear ends depressed,and in which the surface between the ends K K is practically horizontal,substantially as and for the purpose specified.

7. The combination of the frame D E, having holes 6, with the removablehelical cuttergrates K, in which their forward ends are raised and theirrear ends depressed, and their center provided with a shank, K,substantially as and for the purpose specified.

8. A rotary grate having beveled teeth F and flange G, in combinationwith anti-friction wheels J, formed with large flange j, upon which thegrate rests, and groove J, shaped to conform to the gear-teeth on thegrateframe flange, said roller being used to sup- Having now describedour invention, what 1 port said flange and receive the teeth,- and hole6, in combination with helical grates K, having notches l, and shank Ksubstantially as and for the purpose specified.

In testimony of which invention We have I 5 hereunto set our hands.

EDWARD MOFARLAN D. LEVIS PASSMORE.

Witnesses:

FRANCIS S. BROWN, HENRY A. MoMURRoW.

